Proto:Sonic & Knuckles

Leaked on February 23, 2008 by drx, these prototypes were part of a huge package filled with prototypes from Sega of America from around 1994-95. Dated after Sonic the Hedgehog 3, these prototypes offer a look behind the scenes at the game's development.

Sonic 3C 0408Dated April 8, 1994. Early build of an unreleased version of Sonic 3, while many things were still being implemented.

Sonic 3C 0517Dated May 17, 1994. Just before the "Limited Edition" Sonic 3 was canceled, one last prototype was made.